When you test make up water you can't just take a reading from a portion of salt from a bag, you need to mix the entire bag to get an accurate measurement. Otherwise you're going to get different results every time.
The pro is high in magnesium, if you find this level climbing you could simply switch to the regular.
Also Ocean Pure salt is low in ALK, I believe it contains higher than normal Boron levels which also in turn produces inaccurate results on the high end for test kits. Meaning with ocean pure salt you need to maintain higher than normal alkalinity to achieve normal alkalinity levels. Make sense?? I'm not 100% on this but do remember reading this a few places.
Not to add to it, but OP is also low in iodine which is bad for inverts, many users will find their crabs and shrimp parish more than normal.
I used this salt at one point but have since switched to TMP and much happier.
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